作者pcchiou (kk)
看板TransBioChem
标题Re: [化学] 问一题考古题
时间Mon Jun 18 02:18:19 2012
※ 引述《clvf (Ocean)》之铭言：
: the urban air pollution is often due to the release of NOx that is
: mainly consisted of NO and NO2. NOx may be catalytically converted
: into nitrogen and water with use of ammonia.
: in order to have complete conversion of 6.0L NOx in which the molar
: ratio of NO and NO2 is 1:2 under the same temperature and atomospheric
: pressure, how many liter of ammonia will be needed at least?
: (a)3.0 (b)6.0 (c)12.0 (d)20.0
: 出处http://tinyurl.com/7gkbd47
: 算了很久 算不出答案....
: 烦请版上神人帮忙解答
: 谢谢!!!
PV=nRT
定温定压 V正比n 总体积是6L 所以NO:2L NO2:4L
先把方程式写出来
6NO + 4NH3 → 5N2 + 6H2O
2L
-2L -(2/3)2L
6NO2 + 8NH3 → 7N2 + 12H2O
4L
-4L -(4/3)4L
所需NH3: 4L/3 + 16L/3 = 20L/3 = 6.666..L = 6.67L
所以至少要超过 6.67L 故选 (C) 12L
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1F：推 clvf:可是板上答案一致都是B耶= = 06/18 14:19
2F：推 clvf:不过我的算法跟你一样 但是题目问至少需多少 这样根本没答案 06/18 14:23
3F：→ pcchiou:是噢我的考古题书是写c噢 06/18 16:32
4F：→ pcchiou:有时相信自己也不错噢^.< 06/18 16:52